1203156 has 36 divisors (see below), whose sum is σ = 3203200. Its totient is φ = 379728.

The previous prime is 1203151. The next prime is 1203161. The reversal of 1203156 is 6513021.

It is an interprime number because it is at equal distance from previous prime (1203151) and next prime (1203161).

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1203151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 196 + ... + 1563.

2^1203156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1203156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1601600).

1203156 is an abundant number, since it is smaller than the sum of its proper divisors (2000044).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1203156 is a wasteful number, since it uses less digits than its factorization.

1203156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788 (or 1783 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1203156 is about 1096.8846794445. The cubic root of 1203156 is about 106.3589351019.

Adding to 1203156 its reverse (6513021), we get a palindrome (7716177).

The spelling of 1203156 in words is "one million, two hundred three thousand, one hundred fifty-six".